PSTAR is the tumor size predicted by the model. It is therefore used as a prediction for the observations in the project.
At the end of the scenario or of SAEM, individual predictions of the tumor size PSTAR are computed using the individual parameters available. Thus, individual predictions of the tumor size PSTAR are computed using both the conditional modes (indPred_mode), the conditional mean (indPred_mean), and the conditional means estimated during the last iterations of SAEM (indPred_SAEM) and saved in table predictions.txt.
Notice that the population prediction is also proposed.

Remark: the same model file tgi_model.txt can be used with different tools, including Mlxplore or Simulx (see this Shiny application for instance).